YOU SAID:
I will die in exactly forty fortnights
INTO JAPANESE
私はちょうど40の夜に死ぬ
BACK INTO ENGLISH
I will die on just 40 nights
INTO JAPANESE
私はわずか40泊で死にます
BACK INTO ENGLISH
I will die only for 40 nights
INTO JAPANESE
私は40泊だけ死ぬ
BACK INTO ENGLISH
I only die 40 nights
INTO JAPANESE
私は40泊だけ死ぬ
BACK INTO ENGLISH
I only die 40 nights
That didn't even make that much sense in English.